高效CdS量子点敏化B/S共掺杂纳米TiO2太阳能电池的制备及光电性能研究

采用水热法制备硼硫(B/S)共掺杂纳米二氧化钛(B-S-TiO₂), 并配制成浆料, 利用丝网印刷技术在FTO导电玻璃上制备B-S-TiO₂薄膜; 用化学浴沉积(CBD)法制备了CdS量子点敏化B-S-TiO₂薄膜电极, 并用X射线衍射(XRD)、电子显微镜(TEM)、元素分析能谱(EDS)和紫外-可见光谱对其进行表征分析; 结果显示: B/S共掺杂不会改变TiO₂的晶型, 掺杂后的TiO₂吸收边带发生明显红移, 吸收强度显著增强; 同样用化学浴沉积的方法制备NiS工作电极, 用改性的聚硫化物((CH₃)₄N)₂S/((CH₃)₄N)₂S_n)电解液, 组装CdS量子点敏化硼硫(B/S)共掺杂纳米二氧化钛(B-S-TiO₂)太阳能电池, 并测试电池光电性能。测试结果表明, 在AM1.5G的照射下, 电池的能量转化效率(η)由3.21%增大到3.69%, 提高了14.9%, 电池获得高达 (V_oc)1.218 V的开路电压和3.42 mA/cm²的短路光电流(J_sc), 以及高达88.7%的填充因子(ff)。

Boron and Sulfur Co-doped TiO2 Nanofilm as High Efficiency CdS Quantum-dot-sensitized Solar Cells

B and S co-doped TiO₂ was prepared by a typical hydrothermal synthesis. Then the obtained B-S-TiO₂ was dissolved in organic solvent to form paste and then coated on FTO conducting glass by screen printing to prepare nanofilm. The CdS/B-S-TiO₂ composite electrodes was obtained by chemical bath deposition (CBD) using B-S-TiO₂ nanofilm and CdS quantum dots (QDs). The obtained samples were characterized by EDS, XRD, TEM and UV-Vis. The results show that B and S do not change the structure of anatase TiO₂. Noticeable shifts of absorbance edge towards longer wavelength were observed and the absorbance intensity of the B-S-TiO₂ nanofilm increases significantly. Furthermore, NiS was prepared as counter electrode by CBD and a modified polysulfide redox couple, ((CH₃)₄N)₂S/((CH₃)₄N)₂S_n, was employed as electrolyte to assemble CdS quantum-dots (QDs)-sensitized solar cells. The measurements show that the cells have an enhanced energy conversion efficiency under AM 1.5 G illuminations which increased from 3.21% to 3.69%, about 14.9% increment, with a significantly high open voltage (V_oc) of 1.218 V, a high filled factor (ff) of 88.7%, and a short-circuit photocurrent (J_sc) of 3.42 mA/cm².